Size M Blue Shadow Ginny Block Mesh One-piece Swimsuit $245 vs Women's Bottom Turn Racerback Bikini Top: which is safer?

Patagonia Women's Bottom Turn Racerback Bikini Top is the clear pick. Onia Size M Blue Shadow Ginny Block Mesh One-piece Swimsuit $245 carries a failing PFAS grade, and we never recommend buying a failing product.

Onia Size M Blue Shadow Ginny Block Mesh One-piece Swimsuit $245

Onia

Size M Blue Shadow Ginny Block Mesh One-piece Swimsuit $245

PFAS grade

Good 65/100

Overall grade

Good 57/100

Verdict

Skip

Hazard flags

⚑ 2

Material

nylon mesh (primary fiber)

Confidence

72%

PossibleElastic degradation and microfiber shedding

PossibleMold and bacterial growth if wet-stored

Why this grade

Our pick

Patagonia Women's Bottom Turn Racerback Bikini Top

Patagonia

Women's Bottom Turn Racerback Bikini Top

PFAS grade

Excellent 90/100

Overall grade

Excellent 86/100

Verdict

Buy

Hazard flags

⚑ 1

Material

Nylon/polyester blend with elastane (standard swimwear)

Confidence

72%

PossibleElastane (spandex) degradation under heat or chlorine

Why this gradeBuy

Where these two actually differ

  • We flag Elastic degradation and microfiber shedding and Mold and bacterial growth if wet-stored on the Onia and not on the Patagonia.
  • We flag Elastane (spandex) degradation under heat or chlorine on the Patagonia and not on the Onia.
  • The Onia is nylon mesh (primary fiber) where the Patagonia is Nylon/polyester blend with elastane (standard swimwear), which is most of the difference in these two grades.
  • The gap is 25 points, wide enough that this is not a close call, and the Patagonia is the one to buy.

Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →

More swimwear: see the full ranking